Jefferson County's estimated 2026 population is 580,543 with a growth rate of 0.02% in the past year according to the most recent United States census data. Jefferson County is the 4th largest county in Colorado. The 2010 population was 535,567 and has seen a growth of 8.4% since that time.
Data after 2023 is projected based on recent change
Overall: 40.5 years
Female: 41.6 years
Male: 39.4 years
There are 472,407 adults, (103,643 of whom are seniors) in Jefferson County.
Female: 287,789 (49.7%)
Male: 291,588 (50.3%)
The racial composition of Jefferson County includes 79.47% White, and smaller percentages for other race, Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 460,410 | 79.47% |
| Two or more races | 73,436 | 12.67% |
| Other race | 17,022 | 2.94% |
| Asian | 16,970 | 2.93% |
| Black or African American | 6,880 | 1.19% |
| Native American | 4,226 | 0.73% |
| Native Hawaiian or Pacific Islander | 433 | 0.07% |
Jefferson County's average per capita income is $68,137. Household income levels show a median of $110,656. The poverty rate stands at 6.68%.
Name | Median | Mean |
|---|---|---|
| Married Families | $155,137 | $189,722 |
| Families | $138,654 | $172,185 |
| Households | $110,656 | $142,995 |
| Non Families | $68,952 | $89,701 |
Average Income
Median Household Income
Poverty Rate
